Check-valve.



G. W. DAY.

CHECK VALVE.

APPLICATION FILED 001131913,

1,120,696, Pzitented Dec. 15.1914.

ZJzi in @5565 Z2 21 Z07" tional I! EI F; A i R i r: e sildlififiiPrlflll ll li-l tlldlilii].

GEORGE W. DAY, OF CHICAGO, ILLINOIS.

CHECK- VALVE.

l jfl ikfigf, Specification of Letters Patent. Patent d D 15 1914 alication filed October 13, 1913. Serial No.

am-a ii: int 2 1 concern: 1 known that l, GEORGE W'. DAY, a of theUnited States, residing at v in the county of Cook and State uuois, haveinvented certain new and 1:...ul lmprovcnicuizs in Check-Valves, ofwhich the followinga full, clear, concise, and exact descriptum,reference being had to the accompanying drawings, forming a part of thisspecification. V

My invention relates to check valves and, while it may he emphvyeltl inany fluid sys tern where a check valve is desired, 1 contemplate its useparrmularly in connection with pneumati tires such as are employed in.autom-ol 'les and ycles.

The in cation lies in certain features of the structure, the objects ofwhich areto simplify the construction, use and repair oi the device andto provide a unit which essentially comprises the necessary valveelements. By the provision of such a structure I eliminate theinconveniences encountered in devices oi the prior art when access tothe interior parts is to be had and the'liability of losing smalldetachable parts under these circumstances.

In order to instruct those skilled in the art in the use of myinvention; I have illus trated and shall describe a specific form of mydevice andshall refer to its application to apneumatic tire.

In the accompanying drawingsFigure l is a cross-sectional view of apneumatic tire arrangement, showing my valve applied thereto; Fig. is anenlarged axial secview of the structure of my invention'; Fig. 3 is across-sectional view taken on the plane of the line 3-3 of F ig. 2 andlooking in the direction indicated by the arrows, and Fig. -l is anelevational view of a modified form-oi valve member.

Referring first to Fig. 1, the wooden inner felly is lllllStl'lltCCl at5, upon which is placed the metallic rim 6 and the outer casing of thepneumatic tire is illustrated at 7. The inner tube is illustrated at 8,and this inner tube is ymividcd with a threaded valve stem 9 with whicha sum'iorting base 10 is associated and which a nut 11 engages to clampthe stem tightly in place relative to the rim and fellv and the tire.The upper portion 0? the standard 'stem 9 is reduced, as illustrated at12, and this reduced end portion is SCTVV-tl'1l8ild8d,'3S illustrated inFig. 2.

This stein has the usual ccntral'borelthrough which air may bepumpedintothetirc.

The valve casing is in the .form of 311 111- tegral unit 13 providedwitha'central pas sageway the parts of whichare variously formed toaccommodate the associatedmembers. The lower end of the unit 13 istappedfor the reception of the screw+threaded reduced end .12 of the valvestem 9,=and approximately midway bctween theupper and lower ends of thevalve casing a shoulder l i is provided, a compressible washer 15 offiber or rubber bcin g disposed against the shoulder and being firmlyengagcd-bythe end 12 oi the valve stem to form atight joint. The lowerportion of the unit 13 is polygonal, as illustrated, for the receptionof a wrench, and above this polygonalportion the casing 13 has a conicaltendency, as illustrated clearly in Fig. 2. Within the conical portionof the unit 13 is a correspondingly-shaped chamber 16, this chambertcrminating at its upper end in a reduced portion 17 of the bore, whichthen enlarges upwardly by a conical portion 18 into a pocket at the topof the unit.

The valve 19 is in the form of a conical member, convenientlyconstructed of fiber. An upwardly-extending pin 20 is lodged in thevalve member 19 and, as illustrated,

passes upwardly through the passageway 17 and into the pocket above.\Vithin the pocket the valve pin 20 is provided with diametricallyopposite extensions 21, 21, which are conveniently formedby pinching thewire of which the pin is constructed. It willbo seen that theenlargements 21, 21 on the pin may rest upon the conical base walls ofthe pocket and that when they are in this position the valve member 19is hung therefrom and is hold at such a height as to leave aconsiderable distance between it and the passageway 17. It will be seen,however, that pressure within the tire forces the valve 1 against theupper part of the conical chamber, the walls of which this form a valveseat, and closes the passageway 17. \Vhen air is being forced into thethe the valve member 10 is moved into the position illustrated in l ig.2, and it is suspcndcd in that position by means of the extensions 91,21,- as hereinbclorc described. Under these circumstances. the air mayass around the extensions and the pin, as is clear from Fig. 3, andaround the valve member 19, and may r and into the tire.

pass downwardly through the valve stem Under these circumstances, thevalve member is held against any tendency to close. the passageway andact as a check against the air passing in that direction.

p In Fig. 4: I have illustrated amodified form of valve in which the pin20, instead of being pinched to form the lateral extensions thereon, issplit, as illustrated, the resulting halves being turned in oppositedirections so as to form members for engaging the conical base walls ofthe pocket.

It will be seen that the valve member with its pin, before being pinchedor split, may be passed into the valve chamber from below and that thepin, passing into the pocket, may be engaged by a toolto provide thelateral extensions. Once these extensions are provided, the valve isconfined within the limits of its necessary movement and the operationproceeds as set forth. The conical portion of the unit terminates at itsupper end in a part of uniform diameter which is screw-threaded for thereception of a removable cap 22, provided to keep dust from entering thevalve chamber.

I claim as new and desire. to secure by Letters Patent:

1. In a device of the class described, the combination of a valve stemhaving an externally threaded end, an integral casing having aninternally screw-threaded bore at the lower end adapted to engage thethreaded end of the valve stem, an upper chamber, a substantiallyfrusto-conical valve chamber below said'uppe1; chamber, an opening ofcomparatively small cross-section afiording communication between theupper chamber and the smaller end of said frusto-conical valve chamber,an inwardly extending annular flange integral with the balance of thecasing, providing a restricted opening between the frusto-conical valvechamber and said screw-threaded bore, an annular gasket between saidflange and the end of said valve stem, a frusto-conical valve member insaid frusto-c'onical valve chamber, a valve rod fixed to the smaller endof said valve member projecting through the opening connecting thefrusto-conical valve chamber with said upper chamber and provided withmeans 'to suspend said valve member between Lits seat against the wallof said frustoconical valve chamber and said annular iamees flange, theopening between the frusto conical valve chamber and the screw threadedbore being of substantially the same diame-- ter.as the larger end ofsaid frusto-conical' combination of an'integral valve casing hav-' ingan externally screw threaded bore. at itslower end adapted to engage theexternally screw-threaded end of 'a valve stem, an inwardly extendingannular flange integral with the balance of said casing above the saidscrew-threaded bore, a frusto-conical valve chamber above said annularflange, the diameter of the larger end of said frustoconical valvechamber being materially greater than the diameter of the openingbetween said screw-threaded bore and said. frusto-eonlcal valve chamber,the wall of said frusto-con1cal valve chamber being continued upwardlyto form a seat for the frusto-conical valve member, an upper chamber,and an opening of comparatively.

small cross-section between the smallerend j of said frusto-conicalvalve chamber and,

said upper chamber, a fru'sto-conical' valve member in saidfrusto-conical chamber, the diameter of the larger end of sald valvemember being substantially the same-as that of the opening between saidscrew-threaded,

bore and said frusto-conical valve chamber and a valve rod attached tothe smaller end of said frusto-conical valve member and extendingupwardly through the opening between said frusto-conical valve chamberand said upper chamber, and provided with means adapted to suspendsaidvalve member between its seat at the upper end of saidtrusts-conical valve chamber and said" annular flange. In wltnesswhereof, I hereunto subscribe my name this 11th dayof October, A. l).

Witnesses:

A. G. MOCALEB, LEONA D E. Boson,

GEORGE- W. DAY.

